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GLM 5.3 Flashx vs GPT 5.6 Luna

Compare GLM 5.3 Flashx from Z.AI and GPT 5.6 Luna from OpenAI on key metrics including benchmarks, price, context length, and other model features. Access both models and hundreds of others through the AIHubMix API.

Z.AIGLM 5.3 FlashxOpenAIGPT 5.6 Luna
+ Add model · 2/4
Z.AI logo
GLM 5.3 Flashx
Z.AI · text, image, video → text

GLM-5.3-FlashX is Z.AI’s high-speed inference model, designed for coding agents, real-time interactions, long-running agentic workflows, and applications that require fast token generation. It is heavily optimized at the inference infrastructure level for lower latency and higher execution efficiency, reaching generation speeds of up to 200 tokens per second. Compared with GLM-5.3-Flash, GLM-5.3-FlashX delivers up to 5× faster inference, with a stronger focus on low-latency and high-throughput workloads.

Input$0.37 /M
Output$1.25 /M
Cache read$0.075 /M
Details
OpenAI logo
GPT 5.6 Luna
OpenAI · text, image → text

GPT-5.6 Luna is designed for cost-sensitive, high-volume workloads. It roughly corresponds to the nano model tier used in earlier GPT-5 families.

Input$0.2 /M
Output$1.2 /M
Cache read$0.02 /M
Details

Pricing & Specifications

Prices are per million tokens. Time to First Token and throughput are rolling averages measured on AIHubMix.

GLM 5.3 Flashx
GPT 5.6 Luna
Input /M
$0.37
$0.2
Output /M
$1.25
$1.2
Cache read /M
$0.075
$0.02
Context length
1,000,000
1,050,000
Max output
0
128,000
Time to First Token
3.8 s
3.3 s
Throughput
51.7 tok/s
70.6 tok/s
Modalities
textimagevideo
textimage
Supported Parameters
toolsthinkingstructured outputs
API Formats
chat_completions · responses
Released
-
July 9, 2026

Promotional prices show the discounted rate; see each model page for promotion windows.

Activity Past 30 Days

Daily traffic served through AIHubMix — how demand for each model is trending.

glm-5.3-flashxgpt-5.6-luna

Tokens / day

-

Requests / day

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Performance Past 3 Days

Measured on real AIHubMix traffic, hourly buckets. Gaps mean no traffic in that hour.

glm-5.3-flashxgpt-5.6-luna

Throughput (tok/s)

-

TTFT (s)

-

Uptime (%)

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Cost calculator

Estimate your monthly bill for the same workload on each model.

GPT 5.6 Luna
$30.00 /mo
GLM 5.3 Flashx
$40.95 /mo

Monthly = daily × 30. Discounted rates applied where a promotion is active.

FAQ

Which is cheaper: GLM 5.3 Flashx, GPT 5.6 Luna?

GPT 5.6 Luna: $1.2/M output tokens; GLM 5.3 Flashx: $1.25/M. Use the cost calculator above to estimate your own workload.

Which responds faster?

GPT 5.6 Luna: 3.3s time to first token measured on AIHubMix; see the live performance charts above for how each model behaves across the day.

How large is each context window?

GLM 5.3 Flashx accepts 1,000,000 and GPT 5.6 Luna accepts 1,050,000 input tokens.

Which one generates tokens faster?

GPT 5.6 Luna at 70.6 tok/s and GLM 5.3 Flashx at 51.7 tok/s, measured as output throughput on AIHubMix — a separate metric from time to first token.

What inputs and capabilities does each model support?

GLM 5.3 Flashx accepts text, image and video input; GPT 5.6 Luna accepts text and image input and supports tool calling, thinking and structured outputs.

Can I call GLM 5.3 Flashx and GPT 5.6 Luna with the same API key?

Yes. AIHubMix serves every model on this page behind one OpenAI-compatible endpoint, so switching between them is a one-line change to the model field — no second account, key or SDK.

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